anonymous
  • anonymous
hi, amm, why cos^2a+cos^2b+ cos^2 c =1 ? i have to explain it in class :/
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Hero
  • Hero
I wonder what the a, b, and c represent.
anonymous
  • anonymous
angles
Hero
  • Hero
I know that, but what is the relationship between angles a, b, and c?

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anonymous
  • anonymous
oh! i really don't know , we are learning about vectors in 3d, and the teacher gave us that homework :/
Hero
  • Hero
Hmm, I found this identity here: http://en.wikibooks.org/wiki/Trigonometry/For_Enthusiasts/Less-Used_Trig_Identities
anonymous
  • anonymous
thank you!
anonymous
  • anonymous
but is isnt true assuming that \(a, b, c\) are the internal angles of a triangle, take for example \(a=b=c=\frac{\pi}{3}\)
Hero
  • Hero
That's why I linked the link @satellite73
anonymous
  • anonymous
then \(\cos(\frac{\pi}{3})=\frac{1}{2}\) and it is not true that \[3\times\frac{1}{2}=1\]
anonymous
  • anonymous
ahh so i see
anonymous
  • anonymous
o.0 im new in this level of math U.U so i don't really know to much about this U.U
goformit100
  • goformit100
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